CN108667044B - Distributed subsynchronous oscillation suppression device and new energy power transmission system - Google Patents
Distributed subsynchronous oscillation suppression device and new energy power transmission system Download PDFInfo
- Publication number
- CN108667044B CN108667044B CN201810432204.0A CN201810432204A CN108667044B CN 108667044 B CN108667044 B CN 108667044B CN 201810432204 A CN201810432204 A CN 201810432204A CN 108667044 B CN108667044 B CN 108667044B
- Authority
- CN
- China
- Prior art keywords
- subsynchronous oscillation
- power transmission
- distributed
- signal
- transmission line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000010355 oscillation Effects 0.000 title claims abstract description 121
- 230000005540 biological transmission Effects 0.000 title claims abstract description 65
- 230000001629 suppression Effects 0.000 title claims abstract description 63
- 230000005684 electric field Effects 0.000 claims abstract description 40
- 238000004804 winding Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a distributed subsynchronous oscillation suppression device and a new energy power transmission system, wherein the distributed subsynchronous oscillation suppression device is respectively arranged on a power transmission line between an electric field outlet end of a distributed new energy and a bus bar, and comprises: the signal acquisition equipment is connected with the power transmission line and is used for respectively acquiring subsynchronous oscillation signals of the distributed subsynchronous new energy electric field; the subsynchronous oscillation suppression device is connected with the signal acquisition device and is used for outputting subsynchronous oscillation impedance signals according to the subsynchronous oscillation signals; and the transformer is connected with the subsynchronous oscillation suppression equipment and is arranged on the power transmission line in series and is used for injecting subsynchronous oscillation impedance voltage into the power transmission line according to the subsynchronous oscillation impedance signal. The distributed subsynchronous oscillation suppression device can respectively and pertinently suppress each new energy electric field, and subsynchronous oscillation signals which cannot be suppressed can be greatly reduced, so that a better suppression effect is achieved.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a distributed subsynchronous oscillation suppression device and a new energy power transmission system.
Background
Based on the rapid development of new energy power generation, china has become the country with the largest wind power grid-connected capacity and the fastest photovoltaic development. However, with the large-scale grid connection of new energy sources such as wind power and the like, the method brings new problems for the safe and stable operation of the power system besides the accompanying huge economic benefits. Obvious subsynchronous oscillation phenomenon is found in a plurality of wind power bases such as northwest, north China, northeast China and the like in China. Subsynchronous oscillation has become an important problem for safe and efficient operation of large new energy sources in China.
Typical subsynchronous oscillation suppression devices at present are mainly divided into a parallel subsynchronous oscillation suppression device and a serial subsynchronous oscillation suppression device, and excellent effects are obtained in suppressing subsynchronous oscillations of thermal power.
However, because the existing new energy subsynchronous oscillation suppression device is often intensively fixed on a power supply side or a power transmission line to intensively suppress subsynchronous oscillations of all lines, the subsynchronous oscillations caused by the grid connection of distributed new energy are relatively complex due to large difference of the operation conditions of the new energy electric fields, the subsynchronous oscillations after the grid connection of the distributed new energy electric fields are suppressed by adopting the existing subsynchronous oscillation suppression technology, the subsynchronous oscillation suppression signals on a parallel network line are also required to be considered to be distributed to each new energy electric field, the amplitude and the frequency of the subsynchronous oscillations generated by different new energy electric fields are possibly different, after the grid connection, the subsynchronous oscillations are extremely complex, and the subsynchronous oscillation signals cannot be suppressed in a mode of intensively suppressing the multiple lines after the integration, so that the suppression effect is not ideal.
Disclosure of Invention
The invention aims to solve the technical problem of improving the suppression effect of subsynchronous oscillation caused by grid connection of a distributed new energy electric field.
The embodiment of the invention provides a distributed subsynchronous oscillation suppression device, which is respectively arranged on a power transmission line between a distributed new energy electric field outlet end and a bus bar, and comprises: the signal acquisition equipment is connected with the power transmission line and is used for respectively acquiring subsynchronous oscillation signals of the distributed subsynchronous new energy electric field; the subsynchronous oscillation suppression device is connected with the signal acquisition device and is used for outputting subsynchronous oscillation impedance signals according to the subsynchronous oscillation signals; and the transformer is connected with the subsynchronous oscillation suppression equipment and is arranged on the power transmission line in series and is used for injecting subsynchronous oscillation impedance voltage into the power transmission line according to the subsynchronous oscillation impedance signal.
Optionally, the signal acquisition device comprises: the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line; the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal; and the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signals.
Optionally, the oscillation suppression device includes: the control module is connected with the signal acquisition equipment and is used for outputting a control signal according to the subsynchronous oscillation signal; the converter is connected with the power transmission line and used for outputting a subsynchronous oscillation impedance signal under the control of the control signal.
Optionally, the converter includes: an H-bridge inverter.
Optionally, the H-bridge converter comprises a full-bridge H-bridge converter or a half-bridge H-bridge converter.
Optionally, the signal acquisition device is further used for acquiring a stable operation signal used for representing stable operation of the power transmission of the distributed new energy power transmission system in the power transmission line; the control module is also used for controlling the converter to adjust the power flow of the power transmission line according to the stable operation signal.
Optionally, primary windings of the transformers are connected in series to the transmission line; the secondary winding of the transformer is connected with the alternating current output end of the converter.
Optionally, the distributed subsynchronous oscillation suppression device further includes: and the bypass switch is arranged between the converter and the transformer in parallel, is connected with the control module and is used for executing opening/closing actions under the control of the control module.
According to a second aspect, an embodiment of the present invention provides a new energy transmission system, including: a plurality of distributed new energy electric fields; the bus is used for collecting the power transmission lines of each distributed new energy electric field; the distributed subsynchronous oscillation suppression device described in any one of the first aspects is connected in series with the bus bar at the electric field outlet ends of a plurality of distributed new energy sources.
The embodiment of the invention provides a distributed subsynchronous oscillation suppression device, which is respectively and correspondingly arranged on a power transmission line between an electric field outlet end and a bus of a distributed new energy source, wherein a signal acquisition device of the device acquires subsynchronous oscillation signals on the power transmission line and transmits the acquired subsynchronous oscillation signals to subsynchronous oscillation suppression equipment, the subsynchronous oscillation suppression equipment outputs subsynchronous oscillation impedance signals according to the subsynchronous oscillation signals, and a transformer connected in series on the power transmission line injects subsynchronous oscillation impedance voltages into the power transmission line according to the subsynchronous oscillation impedance signals. The distributed subsynchronous oscillation suppression device can subsynchronous suppress the lines of each new energy electric field in a targeted manner only by collecting the subsynchronous oscillation signals of the corresponding new energy electric field, and has more pertinence compared with a concentrated manner of concentrating and suppressing a plurality of lines, thereby improving the suppression effect.
Drawings
FIG. 1 is a schematic diagram of a distributed sub-synchronous oscillation suppression device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a distributed sub-synchronous oscillation suppression device according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a distributed sub-synchronous oscillation suppression device according to another embodiment of the present invention;
fig. 4 shows a schematic topology of a converter in an embodiment of the invention;
fig. 5 shows another topology diagram of a converter in an embodiment of the invention;
fig. 6 shows a schematic diagram of a new energy transmission system in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides a distributed subsynchronous oscillation suppression device, which is respectively arranged on a power transmission line between an output line end and a bus of a distributed new energy electric field, and respectively arranged on the output line of the distributed new energy electric field, and respectively suppresses subsynchronous oscillation of different new energy electric fields, as shown in fig. 1, and comprises:
the signal acquisition equipment 10 is connected with the power transmission line 1 and is used for acquiring the last synchronous oscillation signal of the power transmission line 1; a subsynchronous oscillation suppression device 20 connected to the signal acquisition device 10 for outputting a subsynchronous oscillation impedance signal according to the subsynchronous oscillation signal; a transformer 30 connected to the subsynchronous oscillation suppression device 20 and installed in series on the power transmission line 1 for injecting a subsynchronous oscillation impedance voltage into the power transmission line 1 according to the subsynchronous oscillation impedance signal. In a specific embodiment, the signal acquisition device 10 is connected with the power transmission line 1 between the corresponding new energy electric field outlet end and the bus bar, acquires the line electric signal, and extracts a subsynchronous oscillation signal from the electric signal, wherein the subsynchronous oscillation signal is generated by the operation of the new energy electric field. The amplitude and the frequency of subsynchronous oscillation generated by different new energy electric fields are possibly different, so that the subsynchronous suppression can be respectively carried out on each new energy electric field, and a better suppression effect is achieved.
In an alternative embodiment, as shown in fig. 2, the signal acquisition device 10 may include: the signal acquisition unit 11 is used for acquiring the electric signal in the power transmission line 1. The signal acquisition unit 11 may include at least one of a voltage transformer, a current transformer, and a power transformer. The electrical signal may comprise at least one of a current signal, a voltage signal or a power signal. Because the generated electric frequency range of the new energy electric field is wider and the frequency is not single, the frequency band of the generated subsynchronous oscillation signal is wider, and the filter 12 is used for filtering the electric signal to obtain the subsynchronous oscillation signal, in this embodiment, the filter 12 may comprise a band filter. A phase compensation unit 13 for performing phase compensation on the subsynchronous oscillation signal. Specifically, taking current as an example for explanation, three-phase current on the power transmission line 1 is collected, current under a d-q axis coordinate system is obtained through coordinate transformation, the phase of the current on the power transmission line 1 is obtained through a phase-locked loop, a subsynchronous current signal is extracted according to the current after coordinate transformation, and phase compensation is performed on the subsynchronous current signal, so that a subsynchronous oscillation signal on the power transmission line 1 is finally obtained.
In an alternative embodiment, as shown in fig. 3, the subsynchronous oscillation suppression device 20 may include a control module 21 and an inverter 22, where the control module 21 may generate a pulse switching signal according to the subsynchronous oscillation signal to control the power electronic switch, for example, the on/off of an IGBT, in the inverter 22, so as to obtain a subsynchronous oscillation impedance signal. The transformer 30 injects the subsynchronous oscillation impedance signal into the power transmission line 1 in the form of a voltage, thereby suppressing subsynchronous oscillation in the power transmission line 1. In this embodiment, the transformer 30 may be a relatively lightweight transformer, and the transformer 30 may be hung on a line, for example, a buckle-mounted transformer may be used, and a primary winding of the transformer 30 is connected in series to the power transmission line 1; the secondary winding of the transformer 30 is connected to the ac output of the inverter 22.
The signal acquisition equipment, the subsynchronous oscillation suppression equipment and the transformer are arranged on the power transmission line at the outlet end of one new energy electric field, the signal acquisition equipment can acquire subsynchronous oscillation signals of the new energy electric field, the subsynchronous oscillation suppression equipment can respectively suppress different new energy electric fields, and after grid connection, subsynchronous oscillation is abnormal and complicated due to the fact that the amplitude and the frequency of subsynchronous oscillation generated by different new energy electric fields are different, a mode of intensively suppressing a plurality of lines after the line connection possibly leads to that a plurality of subsynchronous oscillation signals cannot be suppressed, therefore, the subsynchronous oscillation signals which cannot be suppressed can be respectively and purposefully suppressed can be greatly reduced, and a better suppression effect is achieved.
In this embodiment, the converter 22 may be an H-bridge converter, specifically, fig. 4 shows a topological diagram of the H-bridge converter, where the dc voltage provided by the parallel capacitor C is Vdc, and in this embodiment, because the voltage and current resistance of a single IGBT device may meet the requirements due to targeted subsynchronous oscillation suppression on the new energy electric field, a complex main circuit structure such as multiplexing, multilevel, etc. may not be required. The subsynchronous oscillation suppression device 20 has a simple structure and light weight, is beneficial to being directly hung on the power transmission line 1, and can save a large amount of land resources compared with the centralized subsynchronous oscillation suppression device 20. In the present embodiment, the H-bridge inverter may employ a full-bridge H-bridge inverter such as the H-bridge inverter shown in fig. 4; a half-bridge H-bridge converter such as the one shown in fig. 5 may also be employed. In the present embodiment, not limited to the H-bridge converters shown in fig. 4 and 5, a compact converter (not shown in the drawings) of multi-H-bridge cascade may be employed. The multi-H-bridge cascade compact converter can also meet the requirements of simple structure and light weight so as to be directly hung on the power transmission line 1.
To facilitate the input and the output of the distributed sub-synchronous oscillation suppression device, in an alternative embodiment, a bypass switch BRK may be further disposed between the converter 22 and the transformer 30, where the distributed sub-synchronous oscillation suppression device has two states, specifically, as shown in fig. 4, the bypass switch BRK is disposed in parallel between the converter 22 and the transformer 30, the transformer 30 in fig. 4 may be a series transformer, and the distributed sub-synchronous oscillation suppression device is in the input state when the bypass switch BRK is opened, and the distributed sub-synchronous oscillation suppression device is in the output state when the bypass switch BRK is closed. The bypass switch BRK comprises a mechanical switch and a power electronic switch or a mechanical switch and a power electronic switch which are connected in parallel and has the current turn-off and long turn-on operation capabilities. In this embodiment, the bypass switch BRK is connected to the control module 21, and the control module 21 can control the bypass switch BRK to be turned on or off. If the device needs to be taken out of operation, the control module 21 can control the switch to be closed by outputting a control signal for controlling the switch to be closed. In this embodiment, the control module 21 may control the switch according to the electrical signal collected by the signal collecting device, for example, when the subsynchronous oscillation signal is collected, the control switch is turned off, and when the collected electrical signal is an electric field stable operation signal, the control switch may be turned on, so that the distributed subsynchronous oscillation suppression device is out of operation.
In an alternative embodiment, the acquisition device is further used for acquiring a stable operation signal used for representing stable operation of the distributed new energy in the power transmission line 1; the control module 21 is further configured to control the converter 22 to adjust the power flow of the power transmission line 1 according to the steady operation signal.
In the present embodiment, the control strategy in the control module 21 mainly includes the following functions: a subsynchronous oscillation suppression function, a power flow control function, and a switching function between the subsynchronous oscillation suppression function and the power flow control function. Constructing a subsynchronous impedance controller according to the obtained subsynchronous voltage/current signals to obtain trigger pulses of the converter 22 under the subsynchronous suppression function, outputting subsynchronous oscillation impedance signals by controlling the power electronic switch in the converter valve to be opened/closed, eliminating resonance and suppressing the subsynchronous oscillation signals on an operating line; under the power flow control function, the trigger pulse of the converter 22 is obtained according to the obtained signals such as voltage, current, power and the like, and the power flow of the line is adjusted by controlling the converter valve to change the voltage output by the device.
The embodiment of the invention also provides a new energy power transmission system, as shown in fig. 6, which comprises a plurality of distributed new energy electric fields 100 and a bus 200, wherein the bus 200 is used for collecting power transmission lines at the outlet ends of the distributed new energy electric fields 100; the distributed subsynchronous oscillation suppression devices 300 described in the above embodiments are respectively installed on the power lines between the outlet terminals of the plurality of distributed new energy electric fields 100 and the bus bar 200. In the present embodiment, as shown in fig. 6, a series transformer is connected in series to a power transmission line 1 with the power transmission line 1 as a primary winding.
The distributed subsynchronous oscillation suppression devices are respectively arranged on the power transmission lines between the outlet ends of the plurality of distributed new energy electric fields and the bus, and can respectively suppress different new energy electric fields.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (5)
1. A distributed subsynchronous oscillation suppression device, wherein the distributed subsynchronous oscillation suppression device is respectively installed on a power transmission line between a distributed new energy electric field outlet terminal and a bus bar, and the subsynchronous oscillation suppression device comprises:
the signal acquisition equipment is connected with the power transmission line and is used for respectively acquiring subsynchronous oscillation signals of the distributed subsynchronous new energy electric field;
the subsynchronous oscillation suppression device is connected with the signal acquisition device and is used for outputting a subsynchronous oscillation impedance signal according to the subsynchronous oscillation signal;
the transformer is connected with the subsynchronous oscillation suppression equipment, is installed on the power transmission line in series and is used for injecting subsynchronous oscillation impedance voltage into the power transmission line according to the subsynchronous oscillation impedance signal;
the signal acquisition device includes: the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line; the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal; the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signals;
the subsynchronous oscillation suppression device includes: the control module is connected with the signal acquisition equipment and is used for outputting a control signal according to the subsynchronous oscillation signal; the converter is connected with the power transmission line and is used for outputting the subsynchronous oscillation impedance signal under the control of the control signal;
the signal acquisition equipment is also used for acquiring a stable operation signal used for representing the stable operation of the distributed new energy power transmission system in the power transmission line; the control module is also used for controlling the converter to adjust the power flow of the power transmission line according to the stable operation signal;
and the bypass switch is arranged between the converter and the transformer in parallel, is connected with the control module and is used for executing opening/closing actions under the control of the control module.
2. A distributed subsynchronous oscillation suppression device, according to claim 1, wherein said inverter comprises: an H-bridge inverter.
3. A distributed sub-synchronous oscillation suppression device as claimed in claim 2 wherein the H-bridge converter comprises a full-bridge H-bridge converter or a half-bridge H-bridge converter.
4. A distributed subsynchronous oscillation suppression device, as defined in any one of claims 1-3,
the primary side winding of the transformer is connected in series with the power transmission line;
the secondary side winding of the transformer is connected with the alternating current output end of the converter.
5. The utility model provides a new forms of energy transmission system which characterized in that includes:
a plurality of distributed new energy electric fields;
the bus is used for collecting the power transmission lines of each distributed new energy electric field;
the distributed subsynchronous oscillation suppression devices according to any one of claims 1 to 4 are respectively connected in series on the power transmission lines between the plurality of distributed new energy electric field outlet terminals and the bus bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810432204.0A CN108667044B (en) | 2018-05-08 | 2018-05-08 | Distributed subsynchronous oscillation suppression device and new energy power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810432204.0A CN108667044B (en) | 2018-05-08 | 2018-05-08 | Distributed subsynchronous oscillation suppression device and new energy power transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108667044A CN108667044A (en) | 2018-10-16 |
| CN108667044B true CN108667044B (en) | 2024-03-01 |
Family
ID=63778743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810432204.0A Active CN108667044B (en) | 2018-05-08 | 2018-05-08 | Distributed subsynchronous oscillation suppression device and new energy power transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108667044B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226677A (en) * | 2014-11-20 | 2016-01-06 | 国家电网公司 | A kind of control method suppressing wind energy turbine set compensated transmission system subsynchronous resonance |
| CN105633981A (en) * | 2016-01-06 | 2016-06-01 | 江苏省电力公司电力科学研究院 | Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation |
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN208939582U (en) * | 2018-05-08 | 2019-06-04 | 全球能源互联网研究院有限公司 | Distributed sub-synchronous oscillation inhibits device and new energy transmission system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2844731A1 (en) * | 2011-09-12 | 2013-03-21 | Alstom Technology Ltd | Sub-synchronous oscillation damping by shunt facts apparatus |
-
2018
- 2018-05-08 CN CN201810432204.0A patent/CN108667044B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226677A (en) * | 2014-11-20 | 2016-01-06 | 国家电网公司 | A kind of control method suppressing wind energy turbine set compensated transmission system subsynchronous resonance |
| CN105633981A (en) * | 2016-01-06 | 2016-06-01 | 江苏省电力公司电力科学研究院 | Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation |
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN208939582U (en) * | 2018-05-08 | 2019-06-04 | 全球能源互联网研究院有限公司 | Distributed sub-synchronous oscillation inhibits device and new energy transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108667044A (en) | 2018-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111769591B (en) | Double-mode combined control method for multi-inverter system based on double split transformers | |
| CN103312187B (en) | A kind of converter system | |
| EP2466735A2 (en) | Power generation system, power converter system, and methods of converting power | |
| CN105244919B (en) | A kind of robust compensation of delay grid-connected control method of LCL type inverter | |
| CN109066684B (en) | Three-phase active power filter based on LCL filtering and control method thereof | |
| CN110138253A (en) | A kind of photovoltaic combining inverter control method that multi-resonant PR and PI jointly controls | |
| CN102856916A (en) | Reactive power control method and circuit of single-phase photovoltaic inverter | |
| CN105162350A (en) | High-efficiency wide-load-range three-phase micro-inverter and control method thereof | |
| CN101567573B (en) | Uninterrupted power and control method thereof | |
| Lu et al. | Resonance propagation of parallel-operated DC-AC converters with LCL filters | |
| CN108959780A (en) | The big signal simulation model of Monophase electric power electronic transformer | |
| CN102608468A (en) | Testing system for detecting characteristics of offshore wind power flexible direct current transmission converter | |
| CN108667044B (en) | Distributed subsynchronous oscillation suppression device and new energy power transmission system | |
| CN106655738B (en) | A kind of the quasi-single-stage inverter and its control method of no electrolytic capacitor | |
| CN115549490A (en) | Flexible multi-state switch topology circuit and control method thereof | |
| CN102522770B (en) | Transformer-less photovoltaic grid connection detection system and detection method | |
| CN108711872B (en) | Distributed subsynchronous oscillation suppression system and new energy power transmission system | |
| CN104701876A (en) | Topological structure, grid-connected system and control method of offshore wind power plant | |
| CN208939582U (en) | Distributed sub-synchronous oscillation inhibits device and new energy transmission system | |
| CN208674880U (en) | Distributed sub-synchronous oscillation based on energy storage inhibits device and new energy transmission system | |
| CN106998067A (en) | Alternating current active wave filter for compensating HVDC transmission system characteristic harmonics | |
| CN203983990U (en) | Combined parallel filtering compensation arrangement in low voltage complete set | |
| CN208939597U (en) | Distributed sub-synchronous oscillation inhibits system and new energy transmission system | |
| CN208226583U (en) | A kind of miniature photovoltaic grid-connected inverter | |
| CN209709952U (en) | A kind of inverter and photovoltaic DC-to-AC converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Applicant after: ECONOMIC AND TECHNICAL RESEARCH INSTITUTE OF STATE GRID XINJIANG ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID CORPORATION OF CHINA Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Applicant before: ECONOMIC AND TECHNICAL RESEARCH INSTITUTE OF STATE GRID XINJIANG ELECTRIC POWER Co.,Ltd. Applicant before: State Grid Corporation of China |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |